I've spent the last 2 hours driving these concrete screws into concrete blocks. The supplied carbide bits and screws are a great set and I can see that is great customer service from Chenango. I use them for my underground encapsulation project and they get the job done. The carbide bit is durable and comes with the box. The screws seem strong enough to really hook into the concrete and the blue is a corrosion inhibitor (e.g. plastic coating). In addition, the seller Chenango Supply ensured fast and reliable delivery of these screws.
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